I am using an iPhone (iOS 14.6), Shure Motive Video (18.104.22.168) and Davinci Resolve (Mac, 17.2 Build 11) to capture video. When I play back the video file in Quicktime (Version 10.5 (1086.4.2)), the audio and video are in sync, but when I drop it into Davinci Resolve, the video is several seconds ahead of the audio, despite the audio and video timelines looking like they are in sync.
The video file in question is here: https://drive.google.com/file/d/1adRm1rZRs-GKwFfnsw3YE9pMc8xVmIBM/view?usp=sharing
Strangely, if I open the file in Quicktime and export it as "4k", the offset problem goes away and empty audio is inserted at the beginning of the audio timeline, but this means I have to pre-export every source video file.
Is there a way to fix the audio sync problem without opening and exporting from Quicktime?